Dashpot



Dec. 22, 1931. A, HADLEY 1,837,815.

DASHPOT Filed July 5. 1927 i mm\\\\\\\\\\\\\\ INVENTOR g- El 13 HARLANA. HADLEY ATTORNEY Patented Dec. 22, 1931 HARLAN A. HADLEY, OF ST.JOHITSBURY, VERMONT, ASSIGNOR T0 E. AND '1. FAIRBANKS I AND COMPANY, OFST. JGHI lSBUR-Y, VERMONT, A CORPORATION OF VERMONT 'ID'ASHPOTApplication filed July 5, 1927.

This invention relates to improvements in dash pots of that type inwhich the dampening effect is controlled by adjusting the flow of thefluid. While the invention is of general application where dampeningdevices are applicable, the illustrated'preferred embodiment is shown asapplied to a scale of the equal arm type.

A well-known device of the class referred to embodies, as a flowregulating means, two superposed disks-having a plurality of registeringopenings. One of these disks is rigidly attached to the piston rod andthe other disk is rigidly connected to the lower end of a sleevetelescoping the piston rod. The dampening elfectis regulated by turningthe sleeve relative to the piston rod which either widens or narrows'theregistering openings to increase or decrease the rate of the flow of thefluid hrough to the piston formed by the superposed disks. Thedisadvantage of such a construction resides in the limited latitude ofadjustment of the flow of the fluid past the piston. It is accordinglyan object of this invention to provide an improved dash pot constructionadapted to check and control the vibration of scales which will be freefrom the above-mentioned and other disadvantages, allowing a widelatitude of fluid flow adjustment, and which will be more simple,durable and inexpensive in construction and more efficient in operation.

Other features of the invention, together with certain details ofconstruction and combination of parts, will be discussed in thespecification and pointed out in the appended claims.

In the accompanying drawings:

Fig. 1 is a front elevational View of my improved dash pot;

Fig. 2 is a vertical cross-sectional view taken on line 22 in 1;

Fig. 3 is a horizontal cross-sectional view taken on line 3-3 in Fig. 1showing the parts in position when the least resistance will be ofl'eredto the flow of the fluid;

Fig. 1 is a view similar to Fig. 3 but showing the inner cylinderrevolved relative to Serial No. 203,395.

the chamber to offer a greater resistance to i the flow of the fluid;and

Fig. 5 is a front elevational view of a scale showing my improved dashpot attached to a scale lever of an equal arm balance.

In the illustrative device there is shown an outer cylinder generallyindicated by the ref erence number 1. This cylinder is a casting havingat the bottom thereof an integral flange 2 carrying diametricallyopposed bosses 3 having apertures 4t therein adapted for the receptionof screws to attach the dashpot to a scale, as is shown in Fig. 5. Theouter cylinder has cast integrally therewith and extending verticallythereof a chamber 5, the purpose of which will herein be explained.

A cap 6 is adapted to act as a closure member for outer cylinder 1,which it surmounts, the said cap having a flanged portion 7 and areduced portion 8 through which an aperture 9 is bored. Attached to theinner periphery of the flange 7, preferably by a force flt, is acylinder 10 having a rectangular slot 11 therein extending substantiallythe full length thereof. The cylinder 10 is adapted to telescope downonthe inside of outer cylinder 1 will hereinafter be designated as theinner cylinder.

The dash pot piston 12 is mounted on the inner end of a piston rod 13.The outer end of the piston rod extends out through the aperture 9 inthe reducedportion 8 of cap 6 and is reduced at its extremity to form aflat portion 14- which has an aperture 15 therein. The flat portion andthe aperture therein form a connection to a clevis 16 attached to ascale lever 17 of an equal arm scale 18. The dash pot outercylinderbeing fastened to a base 19 of the scale as by screws 20.

In operation, when the slot 11 and the chamber 5 coincide, as is shownin Figure 3, there will be a minimum of resistance to the flow of thefluid contained in the cylinders and therefore the checking or dampen:ing effect is at a minimum. Asthe inner cylinder 10 is rotated byturning the cap 6, as shown in Figure 4, the slot 11 is moved relativeto the chamber opening, the flow of the fluid becomes more and morerestricted 4 p. it]

as the opening into the inner cylinder be comes smaller and thedampening effect is accordingly increased. The cap is knurled, as at 21,to facilitate the turning of the inner cylinder, said cylinder beingheld in its adjusted position by meansot' a set screw 22 cooperatingwith groove 23 in the outer periphery of the inner cylinder.

Having described my invention, what I claim as new and desire to secureby Letters Patent of the United States, is:

1. In a device of the character described, an outer cylinder, a chamberconnected therewith, an inner cylinder telescoping said first namedcylinder and having closure means thereon co-operating with the saidouter cylinder, and means in said inner cylinder for cooperating withthe chamber to control the flow of a fluid therethrough.

2. In a device of the character described, an outer cylinder, a chamberconnected therewith, an inner cylinder telescoping said first namedcylinder, having rotatable closure means for adjusting the said innercylinder and also having a slot therein, said slot cooperating with saidchamber to control the flow of a fluid therethrough.

I In a device of the character described, an outer cylinder, a chamberconnected therewith, and an inner cylinder telescoping said outercylinder rotatable therein and surmounted by a closure member providedwith a flange portion co-operating with and rotatable on the upper endof the said outer cylinder, said cylinder having a slot therein, thecylinder being movable relative to the chamber to control the flow of afluid therethrough.

, fl. In a device of the character described, a cylinder, a chamberconnected therewith, a cap surmounting the outer cylinder, a cylinderattached to said cap and adapted to be rotated thereby, and means insaid secondmentioned cylinder adapted to cooperate with said chamber tocontrol the flow of a fluid.

5. In a device of the character described, an outer cylinder, a chamberconnected therewith, a cap surmounting the outer cylinder, an innercylinder rotatable within said outer cylinder, said inner cylinder beingattached to said cap, and means in said inner cylinder adapted tocooperate with said chamber to control the flow of a fluid therethrough.

6. In a device of the character described, an outer cylinder, a chamberconnected therewith, a cap surmounting the outer cylinder, an innercylinder attached to said cap contained within said outer cylinder androtatable therein, said inner cylinder having a slot therein adapted tocooperate with said chamher to control the flow of a fluid therethrough,a piston movable in said inner cylinder and a piston rod connected tosaid piston and ex-' tending through said cap.

7. In a device of the character described, a, cap, and a telescopinginner and outer cylinder, the inner cylinder being attached to the capand adjustably mounted on the outer cylinder, a chamber in the outercylinder, the inner cylinder having a slot therein, the said chamber andslot cooperating to control the flow of a fluid therethrough.

8. In a device of the character described, an outer cylinder, a chamberconnected therewith, a cap surmounting the outer cylinder, an innercylinder attached to the said cap and rotatable within the said outercylinder, and means in the outer cylinder cooperating with a groove inthe outer wall of the said inner cylinder for securing the innercylinder in its adjusted position.

9. In a device of the character described, an outer cylinder, a chamberconnected therewith, a cap surmounting the outer cylinder, an innercylinder attached to the said cap and rotatable within the said outercylinder, means in the outer cylinder co-opera'ting with a groove in theouter wall of the said inner cylinder for securing the inner cylinder inits adjusted position, and means in the said inner cylinder adapted toco-operate with the said chamber to control the flow of a fluidtherethrough.

10. In a device of the character described, a cap surmounting the outercylinder, telescoping inner and outer cylinders, the inner cylinderbeing attached to the cap and being adjustably mounted on the outercylinder, a chamber in the outer cylinder, the inner cylinder having aslot therein, the said chamber and slot co-operating to control the flowof. a fluid therethrough, and means in the outer cylinder co-operatingwith the inner cylinder for locking the said inner cylinder in itsadjusted position.

11. In a device of the character described, an outer cylinder, a chamberconnected therewith, a cap surmounting the outer cylinder, an innercylinder attached to said cap and adapted to be rotated thereby, theinner cylinder being provided with a slot therein co operating with anopening in the outer cylinder leading to the said chamber, and avertically operating piston. adapted to move in the said inner cylinderin co-operation with the said slot and opening and in accordance withthe flow of a fluid therethrough.

In testimony whereof, I have signed my name to this specification. 1

HARLAN A. HADLEY.

